A Project is a tool that, as it is stated in its name, will help you follow each and every one of your projects (both internal and external).
Projects allow you to manage and visualize the resources necessary to achieve your goals, including colaborators that will be executing Tasks related to the project.
With this tool you can keep track of your business deals since it is possible to sort Projects by importance, progress and deadlines among others.
You can also create Milestones for your projetcs. This way it is easier to get the real picture, see progress and improve how your colaborators can interact to achieve business goals faster more effectively.